function ecrire_cookie(nom, valeur)
{
	var date = new Date(2019, 1, 1);
	document.cookie=nom+"="+escape(valeur)+"; expires="+date.toGMTString();
}

function arguments_cookie(offset)
{
	var endstr=document.cookie.indexOf (";", offset);
	if (endstr==-1) endstr=document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr)); 
}

function lire_cookie(nom)
{
	var arg=nom+"=";
	var alen=arg.length;
	var clen=document.cookie.length;
	var i=0;
	while (i<clen)
	{
		var j=i+alen;
		if (document.cookie.substring(i, j)==arg)
			return arguments_cookies(j);
		i=document.cookie.indexOf(" ",i)+1;
		if (i==0) break;
	}
	return null; 
}
